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Forums >> Revit Building >> Technical Support >> Light Source in Revit - the dead horse

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Wed, Oct 31, 2012 at 8:59:45 PM | Light Source in Revit - the dead horse

#1

crwinchester


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Like the Subject says, I hope I'm not beating a dead horse, but I still cannot find a solution to getting a light to show in a rendering. I've tried many of the suggestions in in the treads:

-Light source not in the ceiling

-Wattage has been toggled by hundred fold

-Default Light Source Material set to self-illuminating

-All lights are on

-light is displaying in realistic view

-LIGHTS DO NOT RENDER!

Here's what I'm doing and hopefully someone can see where I slipped up:

I'm building a Light Fixture family where I have a vintage bulb. The Bulb itself is a revoled mass and the material has been set to clear glass and default light source material. I have the light source inside of the "bulb." Could this be the issue? Can you put a light source inside of a clear object? Or does Revit dislike this? What is the correct process for this? 



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Wed, Oct 31, 2012 at 10:50:34 PM | Light Source in Revit - the dead horse

#2

mbsteve


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what you are doing sounds correct to me, the bulb is a thin revolve? and the light source itself, how many lumens.


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Thu, Nov 1, 2012 at 12:41:37 PM | Light Source in Revit - the dead horse

#3

WWHub


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If the light source is inside the "bulb" or behind a lense (Which is how I do them), then that bulb/lense material has to be transparent!  The name clear glass doesn't mean it is....  And you say it is assigned two different materials - clear glass and default light source.  Can't be both.  You need a material that glows when on and is transparent.


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Thu, Nov 1, 2012 at 2:14:02 PM | Light Source in Revit - the dead horse

#4

crwinchester


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It is a revolve with a thickness of 1/16". I had tried both materials not both at the same time. The light source I tried as 60 Watts, 600 watts, and over 8900 lm. The material now is set as default light source and the material has transparency on with a setting of 49. Still renders black. 



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Thu, Nov 1, 2012 at 3:22:24 PM | Light Source in Revit - the dead horse

#5

WWHub


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Well you just cut the light level in half.  Make it 100% transparent and see what happens.

 

BTW - We are assuming you have a real light source in the family - not just the "bulb"


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Thu, Nov 1, 2012 at 3:29:51 PM | Light Source in Revit - the dead horse

#6

alabaster2513


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you can see the light source in the AO photo. looks like the light is being emitted from a point with spherical distribution but its inside the geomtery.


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Thu, Nov 1, 2012 at 4:07:05 PM | Light Source in Revit - the dead horse

#7

crwinchester


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That's my question really. There is a spherical light source inside the thin revolve I mentioned above, but it wont show through. It seems like any amount of transparency on the material should make the source visible. I will try 100% transparency and see what happens. 


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Thu, Nov 1, 2012 at 4:17:43 PM | Light Source in Revit - the dead horse

#8

crwinchester


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100% transparency = fail. This getting pretty silly. What else am I missing here? 



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Thu, Nov 1, 2012 at 4:20:21 PM | Light Source in Revit - the dead horse

#9

alabaster2513


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upload your family, ill take a look


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Thu, Nov 1, 2012 at 5:36:28 PM | Light Source in Revit - the dead horse

#10

crwinchester


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Here's my revit family:



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Thu, Nov 1, 2012 at 6:04:10 PM | Light Source in Revit - the dead horse

#11

WWHub


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Edit that family, edit the bulb sketch and copy sketch to clipboard.  Now get out of the edit and delte that thing.  It has a fixed light source material assigned.  Create a new revolve using your sketch and assign it a new material called lightbulb set to 100% transparent.  Then it works!


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Thu, Nov 1, 2012 at 6:05:16 PM | Light Source in Revit - the dead horse

#12

alabaster2513


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renders just fine when i put it into a blank project. possibly you have the transparent material correct in the family but not in the project?

 

try this one, you can change the material in the project easily now



Edited on: Thu, Nov 1, 2012 at 1:09:39 PM

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Thu, Nov 1, 2012 at 8:26:28 PM | Light Source in Revit - the dead horse

#13

crwinchester


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WWHub, your method ended up working for me. Alabaster, the family you sent me for some reason had the same issue. Based on that I'm wondering, like was mentioned, if there was something bad with the revolve in the family having a material set to it that conflicted with the project. Only when a new generic material is made and the settings for transparency and self illumination defined from scratch does it begin to work. The horse is dead. Thanks so much you guys! I really appreciate your patience with me in helping me understand how to get to the bottom of this issue.



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Thu, May 6, 2021 at 9:34:17 PM | Light Source in Revit - the dead horse

#14

jpbernier


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Did you ever get this resolved?  I had a devil of a time with a similar issue.  What finally fixed it for me was checking the "Use Rendered Appearance" box in the material editor, and that activated all of the physical characteristics of the glass for rendering.


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